/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/DisplayClusterRootActor.h
Returns the current rendering mode of this DCRA (not a value from configuration). This value can be overridden from DCRenderDevice or other rendering subsystems (e.g. Preview).
[EDisplayClusterRenderFrameMode](API\Plugins\DisplayCluster\Render\Viewport\RenderFrame\EDisplayClusterR-) GetRenderMode() const